The calibration and application of an individual scrummaging ergometer

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• 作者：Andrew Green ; Samantha Kerr ; Chloe Dafkin ; Warrick McKinon
• 关键词：Rugby union ; Kinetics ; Centre of pressure
• 刊名：Sports Engineering
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：19
• 期：1
• 页码：59-69
• 全文大小：832 KB
• 参考文献：1.World Rugby Rule 20.1a. Laws of the Game (Internet). http://​laws.​worldrugby.​org/​index.​php?​law=​20 . Accessed 1 March 2015
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• 作者单位：Andrew Green (1)
  Samantha Kerr (1)
  Chloe Dafkin (1)
  Warrick McKinon (1)
  
  1. Biomechanics Laboratory, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand Medical School, 7 York Road, Parktown, 2193, South Africa
  
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics
  Engineering Design
  Measurement Science and Instrumentation
  Simulation and Modeling
  Materials Science
  
• 出版者：Springer London
• ISSN：1460-2687

文摘

Although the characteristic morphology of rugby forwards playing different positions in the rugby scrum has been well documented, a complete picture of the force characteristics that different players produce has not been evaluated. This is especially true for the movement of the centre of pressure (CoP) elicited during scrummaging in a forward direction. An individual scrummaging ergometer was therefore developed to measure the CoP of an individual scrum action using conventional torque calculations. Calibration of the measurement system revealed measured force errors within 16.6 N of the actual force and errors of less than 3.96 mm for CoP location determination. Thirty-nine club level rugby union players (22 front rows, 11 locks and six back rows) scrummed against the ergometer on an outdoor rugby field. Differences between the three groups were tested using one-way ANOVAs. The maximum force for different players was 2253.6 ± 649.0 N over the entire subject group. There were no differences in the individual compressive force between the groups [front rows: 2404.0 ± 650.3 N; locks: 2185.6 ± 568.9 N; back rows: 1826.9 ± 670.2 N (p = 0.143)]. Individually, front rows started at a higher position than back rows (p = 0.009) and were at a higher vertical position than locks when producing maximum force (p = 0.028). Front rows had lower variation in the CoP (p = 0.044) and less movement to achieve their maximum force (p = 0.020) than locks. Front rows moved less overall than back rows (p = 0.028) during the scrum trial. The design and application of the individual scrum ergometer showed with good limits of agreement that differences in force magnitude and CoP exist within scrummaging players. Practically, the application of this ergometer may assist in the individual optimisation of scrummaging performance.